Preheat the oven to 375F degrees. Spray a 9x9-inch baking dish with nonstick cooking spray.
In a small bowl, whisk together ¼ cup stone ground mustard, 3 Tablespoons honey, 2 Tablespoons olive oil, 2 Tablespoons lemon juice, 1 teaspoon garlic powder, 1 teaspoon rubbed sage and 1 teaspoon kosher salt until smooth.
Place 4 chicken thighs, bone-in and skin on into the prepared baking dish (pat them dry dry them with a paper towel) and pour the honey mustard mixture over the chicken, ensuring each piece is coated well (I try to ensure both sides of the chicken are coated).
Cover the baking dish with foil and bake in the preheated oven for 25 minutes.
Remove the foil, baste the chicken with the pan juices, and bake uncovered for an additional 15 to 20 minutes or until the chicken reaches an internal temperature of 165F degrees and the skin is golden and slightly crisp.
Let the chicken rest for 5 minutes before serving, spooning extra sauce from the pan over each piece.
Notes
Please refer to my FAQ’s (Frequently Asked Questions) and ingredient list above for other substitutions or for the answers to the most common questions.